#!/usr/bin/env python

# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------

"""
An example to show receiving events from an Event Hub partition with EventHubConsumerClient tracking
the last enqueued event properties of specific partition.
"""
import os
from azure.eventhub import EventHubConsumerClient
from azure.identity import DefaultAzureCredential

FULLY_QUALIFIED_NAMESPACE = os.environ["EVENT_HUB_HOSTNAME"]
EVENTHUB_NAME = os.environ['EVENT_HUB_NAME']


def on_event(partition_context, event):
    print("Received event from partition {}.".format(partition_context.partition_id))
    
    # Put your code here. to do some operations on the event.
    # Avoid time-consuming operations.
    print(event)

    print("Last enqueued event properties from partition: {} is: {}.".format(
        partition_context.partition_id,
        partition_context.last_enqueued_event_properties)
    )


if __name__ == '__main__':
    consumer_client = EventHubConsumerClient(
        fully_qualified_namespace=FULLY_QUALIFIED_NAMESPACE,
        consumer_group='$Default',
        eventhub_name=EVENTHUB_NAME,
        credential=DefaultAzureCredential(),
    )

    try:
        with consumer_client:
            consumer_client.receive(
                on_event=on_event,
                partition_id='0',
                track_last_enqueued_event_properties=True,
                starting_position="-1",  # "-1" is from the beginning of the partition.
            )
    except KeyboardInterrupt:
        print('Stopped receiving.')
